"Now we have no news, and everyone is understandably worried. The relatives say they will go to the (Malaysian) embassy to find the ambassador," said Wen Wancheng, whose son was aboard the missing flight.

"The Malaysian ambassador should be presenting himself here. But he's not," Wen said, updating reporters after a regular meeting between Malaysia Airlines officials and family members at a hotel in Beijing.

"Relatives are very unsatisfied. So you hear them saying 'hunger strike'," added the 63-year-old from the eastern province of Shandong, speaking as the search entered its 11th day.